Human HAI-2 Biotinylated Antibody

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Product Details
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Human HAI-2 Biotinylated Antibody Summary

Species Reactivity
Detects human HAI-2 in ELISAs and Western blots. In sandwich immunoassays, less than 0.1% cross-reactivity with recombinant mouse HAI-2B and recombinant human HAI-1 is observed.
Polyclonal Goat IgG
Antigen Affinity-purified
Mouse myeloma cell line NS0-derived recombinant human HAI-2A (R&D Systems, Catalog # 1106-PI)
Accession # O43291
Lyophilized from a 0.2 μm filtered solution in PBS with BSA as a carrier protein.


Recommended Concentration
Western Blot
0.1 µg/mL
Recombinant Human HAI‑2

Human HAI-2 Sandwich Immunoassay

Recommended Concentration
ELISA Detection (Matched Antibody Pair)
0.1-0.4 µg/mL 

Use in combination with:

Capture Reagent: Human HAI‑2 Ectodomain Antibody (Catalog # MAB1106)

Standard: Recombinant Human HAI-2A Protein, CF (Catalog # 1106-PI)

Please Note: Optimal dilutions should be determined by each laboratory for each application. General Protocols are available in the Technical Information section on our website.

Reconstitution Calculator

Reconstitution Calculator

The reconstitution calculator allows you to quickly calculate the volume of a reagent to reconstitute your vial. Simply enter the mass of reagent and the target concentration and the calculator will determine the rest.


Preparation and Storage

Reconstitute at 0.2 mg/mL in sterile PBS.
The product is shipped at ambient temperature. Upon receipt, store it immediately at the temperature recommended below.
Stability & Storage
Use a manual defrost freezer and avoid repeated freeze-thaw cycles.
  • 12 months from date of receipt, -20 to -70 °C as supplied.
  • 1 month, 2 to 8 °C under sterile conditions after reconstitution.
  • 6 months, -20 to -70 °C under sterile conditions after reconstitution.

Background: HAI-2

Two alternatively spliced forms of HAI-2 have been found in human tissues (1). HAI-2A, the full-length molecule and also known as placental bikunin, is a major form expressed in human tissues. Encoded by the SPINT2 gene, HAI-2A consists of two Kunitz domains, and a C-terminal transmembrane domain (1 - 5). Both Kunitz domains can function as inhibitors independent of each other. In addition to HGF activator and trysin, HAI-2A strongly inhibits plasmin, tissue and plasma kallikreins, and factor XIa. In comparison, HAI-2A is a weaker inhibitor of factor VIIa-tissue factor, factors IXa, Xa, and XIIa.

  1. Kataoka, H. et al. (2002) Biochem. Biophys. Res. Comm. 290:1096.
  2. Kawaguchi, T. et al. (1997) J. Biol. Chem. 272:27558.
  3. Marlor. C.W. et al. (1997) J. Biol. Chem. 272:12202.
  4. Muller-Pillasch, F. et al. (1998) Biochim. Biophys. Acta 1395:88.
  5. Delaria, K.A. et al. (1997) J. Biol. Chem. 272:12209.
Long Name
HGF Activator Inhibitor Type 2
Entrez Gene IDs
10653 (Human); 20733 (Mouse)
Alternate Names
HAI2; HAI-2; HAI-2DIAR3; HAI2FLJ45571; Hepatocyte growth factor activator inhibitor type 2; Kop; kunitz-type protease inhibitor 2; PB; Placental bikunin; serine peptidase inhibitor, Kunitz type, 2; serine protease inhibitor, Kunitz type, 2

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